I practice Buddhism. The primary practice of the sect I follow is to chant.

When I chant, I feel better mentally. I have seen others do the same.

I doubt that a scientific study has been done on this. I have no idea how you could do that and control all the variables.

It's something anyone who wants to can try, though you can only go so far without a teacher and some kind of community. And if you live in a country where religious freedom is limited, there would also be challenges.